USTC机试——从一个文件中读出两个矩阵，求出其乘积将矩阵输出到另外一个文件中

//思想：从文件中读入两个矩阵，输出矩阵相乘的结果
#include<stdio.h>
#define N 100
int main(){
    FILE *fp1,*fp2;
	int a[N][N];
	int b[N][N];//定义两个输入矩阵
	fp1=fopen("3.in","r");
	fp2=fopen("3.out","w");
	int n1,m1,n2,m2;//n:行 m:列
	fscanf(fp1,"%d%d",&n1,&m1);
	for(int i=1;i<=n1;i++){
		for(int j=1;j<=m1;j++){
		   fscanf(fp1,"%d",&a[i][j]);//矩阵a赋值
		}
	}
    fscanf(fp1,"%d%d",&n2,&m2);
	for( i=1;i<=n2;i++){
		for(int j=1;j<=m2;j++){
		   fscanf(fp1,"%d",&b[i][j]);//矩阵b赋值
		}
	}
	
    for(i=1;i<=n1;i++){//矩阵c计算赋值
		for(int j=1;j<=m2;j++){
			int temp=0;
			for(int k=1;k<=m1;k++){
			   temp+=a[i][k]*b[k][j];
			}
			fprintf(fp2,"%d ",temp);
		}
		fprintf(fp2,"\n");
	}

return 0;
}